1.electrical energy 2. chemical energy 3. radiant energy 4. nuclear energy 5. mechanical energy 6. heat energy 7. light energy 8. sound energy 9. potential energy 10. kinetic energy 11. energy transfer 12. work 13. power plant 14. hydroelectric power plant 15. nuclear power plant 16. dynamo 17. friction 18. solar heating panel 19. battery 20. furnace